Belt sanding-machine.



' H. M. 00mm, SRQ

B ELT SANDING MACHINE.

APPLICATION FILED AUG. I3, 1M7.

Lam;

inn -5 i nnniw noornn, ea, or trims, Kentucky.

BELT sA vnINe-i/monmn;

To all whom it may concern." t a 1 "Be it knownthat I,HENRY,M. Doo'rnn, Sn, a citizen ofthe United States of America, and a resident ofDayton, inthe county of Campbell and State of Kentucky, have invented a certain new and usefullmprovement in Belt Sanding-Machines, of Which the following is a specification. i

This invention relates to sanding-mat chines In which a continuous belthaving an belt whose "loweredge lies ina countersunk portion made along the centerwof1the table face, between two wide worlesupportmg members thereof, and said belt being also mounted to run over drivingqou lley at one end and over an idler or roller at its other end to reduce wearing-friction at the latter end and at the same time provide for both flat, or ordinary work and curvedbr scroll work in the use of themachine, and, also, for running the belt against What iswknown as waving of'the work. H

The details of structure will be fully here: inafter described and then particularly pointed out in the claims. 1 a

In the accompanyinggsheet of drawings,

Figure 1 is a perspective view, of the machine oontaining my invention in its preferred form; Fig.2, longitudinal section taken along the centerqf the machine; Fig.

3, a transverse section, taken on theline 3,3, of Fig. 2; Fig. 4;, adetail, fragmentary section of the idler end of thesandingbeltg and Fig. 5, adetail fragmentary section of the belt and table showing an auxiliary,l'ad

justable supporting device for] use in ;-prfo-. ducing bevel or angleworkj the fiat.

running facesof the belt.

In these views, 6 i difates arectangular open frame having table orflatktop surface 7, the latter, in turn, having a countersunk, longitudinal center 8 that terminates somewhat from the rearend thereof.

9 indicates a perpendicular shaft join- 1s to recelve rounded or scroll work to be naled in hearings or boxes 10 and 11 at the fore or near end of frame 6, and carrylng between said boxes a tight pulley 12 that is 13 indicates a tightlpulleyhat the upper endiof the shaft 9 that extends beyond the planeofthe table 7 and 14 is a hollow bar or lon gated: head whose bottom flatly rests in thecountersunk part 8 of the table but not the fulllength .ofsuch part 8. a Vertical bo1ts15, 15,: pass downwardly through the hollow head14c-and engage a longitudinal slot16 in the countersunk part 8 of thetable to provide for the longitudinal adjustment of the said 1 head 14, thumbscrews 17 being used ontheupper ends of said bolts for convenient fastening thereofu A, horizontal set screw-18 ismounted on a vertical support 19.,adjacenttthe nearend of thefhead 14 wherebyqthe latterjmay be readily advanced to and held; in adjusted position in the countersunk part 8, 1

tliefarend ofthehead 141 provides verticahidler or roller 23, the lower end of whose shaft or, 21 turns in a plate 22 on the bottom of the head 14 and the upper end of whose saidshaft; 21 bears in a plate20 that, in turn, is adapted to adjustably hold the shaft21 ai idltheidler slightly out of perpendicular when desired, more especially for the puifpose; hereinafter described.

1 y 26 is thesandingl-belt mounted torun over the pulley 13 and idler 23,with the hollow head" 14: intervening its running lengths. The lower edge of this sanding-belt 26 lies below the planeofthetable in the countersunk portion *8 thereof, and the belt proper is made of linen or canvas that is strong and base limited or. low tendency tostretch,

especially when it is made to carry on its t t the operation,iof using the machine, the work or object to ,be dressed isplaced on the table 7 thatis divided. into two broad smoothed, or. dressed against the running lengths of the sanded belt, while; the part C smoothed or dressed against the said round or convex idler end of the sandedbelt, thus adapting the machine to be used by one,two,

or three, or even more operatives at atime,

flat surfaces and at either side of the the hollow head 14 forming a backing or filler-block against which the belt runs while the said work is pressed into abrading contact with its outer-sanded surface along its running lengths, and the idler 20 forming a backing for the scroll or curved work at that end of the belt. It is preferred that the said idler have a rubber Or other like cushioned face to provide a like backing for the belt in the said scroll Work placed against its outer sanded face, an idler wholly of metal being too hard and not pliable enough for that class of work wherein curves of all degrees are to be contended with and require compensating abrading surfaces to accomplish the desired best results.

The slot 16 in the countersunk portion 8 of the table top enables the bolts to be shifted for the desired forward or backward adjustment of the backing-head 14 in acquiring the proper tightening of the sanded belt 26 for successful operation, the thumbscrews 17 facilitating such adjustment at alltimes and especially when it is desired to remove the sanded belt for any purpose, such as replacing it entirely, or for reversing it, in which latter event the lower edge of first use becomes the upper edge of the next use and theabrading surface is also reversed so that the use of such abrading surface is utilized in both directions, the second use being after the sharp edges of the particles forming the abrading surface have. become dull on the first use of the belt and the direction of running movement of the latter is thus not necessary to reverse.

The fastening-bolt 25 and slot 24 in the movable pivot-plate 23 enable the idler 20 to be tilted slightly away from the ordinary perpendicular rearwardly so that the sanded belt can be trued at all times and thereby fortified against running upwardly therefrom, nor, on the other hand, unduly running downwardly to cause its lower edge to wear against the table, especially when the work is in pressing and abrading contact with its face. Imperfectly connecting the opposite ends of said sanded belt is thus also provided for.

For bevel work or angle sanding I pro vide an auxiliary supporting-table 27 that is hinged at 28 atits outer edge and held at varied inclinations by means of hinged props or pawls 29 that engage teeth 30 in the main-table face atopposite ends of said auxiliary table. This auxiliary table is a convenient device adapted for use with my invention, but not claimed as a part of the invention herein.

The machine herein is simple, cheap and easily made, assembled and repaired, and every part thereof easily accessible, and it is obvious that it is easily understood and handled so that any one, not necessarily an expert, can run it.

I claim 1. In a belt sandingdnachine, the combination of a table having a longitudinallycountersunk central portion arranged be tween two wide work-supporting plane-surfaces, a longitudinal slot in said countersunk portion of the table, a vertical drivingshaft journaled at one end of said table and having a pulley at its upper end, a longitudinal filler block or head adjustably mounted in and partially let into said slotted countersunk portion of the table and having at one end thereof a vertical adjustablymounted idler or roller, and a sand-faced belt operatively-engaging said pulley and adjustably-mounted idler or roller and with said block or head intervening its opposite longitudinal running-portions for presenting a backing when the objects to be smoothed or otherwise dressed are brought into frictional engagement with said sanded or abrading face of the belt for flat work and said idler end of the belt presenting a convex sanding-surface for scroll work or the like in the use of the machine.

2. In a belt sandingunachine, the combination of a table having a longitudinal central portion. slightly or partially countersunk between two wide work-supporting plane-surfaces, a longitudinal slot in, said countersunk portion of the table, a vertical driving-shaft journaled at one end of the table and having a pulley surinounting its upper end, a longitudinal filler-block or backing-head slightly countersunk in said countersink of the table, means for adjustably-securing said backing-head in place, means at one end of the said backing-hem] for adjusting it in the countersunk portion of the table, a vertical idler or roller at the opposite end of said backing-head,-means comprising a slotted plate and vertical bolt for supporting and angularly adjusting the vertical plane of the said idler, a sand-faced belt operatively-engaging said pulley and idler and having a presser-backing on said filler-bl0ck for flat and scroll work respectively.

HENRY M. DOCTER. Sn.

' Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. C. 

